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Toxicity of phosphine on the developmental stages of rust-red flour beetle, Tribolium castaneum Herbst over a range of concentrations and exposures

Manivannan, S. (2015) Toxicity of phosphine on the developmental stages of rust-red flour beetle, Tribolium castaneum Herbst over a range of concentrations and exposures. Journal of Food Science and Technology, 52 (10). pp. 6810-6815.

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Abstract

The susceptibility of the developmental stages of rust-red flour beetle, Tribolium castaneum to a range of concentrations of phosphine over varying durations from 24 to 168 h was reconnoitered in the laboratory at 25±2 °C. Responses of the life stages exposed to phosphine were compared with those of un-treated controls over 24, 48, 72, 96, 120, 144 and 168 h exposures and mortality was assessed after 14 days. Among the life stages tested, pupae were more tolerant to phosphine followed by the egg and the larval instars. At 24 h, the maximum LC50 value was observed in case of egg; 1.571 mgL−1; followed by the pupae, 6th instar, 4th instar and 2nd instar larvae with LC50 values of 1.184, 0.336, 0.212 and 0.081 mgL−1 respectively. However, continued exposure of the developmental stages to phosphine, recorded maximum LC values in the pupae followed by egg and the larval instars. A linear increase in the mortality responsewas witnessed in all the insect stages when the exposure periods were extended from 24 to 168 h with increasing concentrations of phosphine, conversely significant increase in mortality was greatly apparent during the initial treatment periods.

Item Type: Article
Uncontrolled Keywords: Phosphine . Tribolium castaneum . Developmental stages . Exposure period . Toxicity
Subjects: 600 Technology > 01 Medical sciences > 17 Toxicology
Divisions: Food Protectants and Infestation Control
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 18 May 2016 06:55
Last Modified: 18 May 2016 06:55
URI: http://ir.cftri.com/id/eprint/12151

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